If your dog is an aggressive chewer then, Big chews are for him. Virtually indestructible, long-lasting, fun chews are flavored to encourage use. Big Chews are made of extra tough nylon, infused with flavors dogs love best. Built strong enough to survive even the largest, heavy-duty chewers. Kennel tested, veterinarian approved and made in the USA. These are a hard dog chew toy for power chewers.